From: David Mosberger-Tang <davidm@hpl.hp.com>
Date: Thu, 28 Apr 2005 04:17:03 +0000 (-0700)
Subject: [IA64] In syscall-entry, use st8 instead of stf8 to clear pt_regs.r8
X-Git-Tag: v2.6.13-rc2~59^2~14^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=060561ff79b01eea58e6d72abfb8e7580ff21f2a;p=pandora-kernel.git

[IA64] In syscall-entry, use st8 instead of stf8 to clear pt_regs.r8

Using stf8 seemed like a clever idea at the time, but stf8 forces
the cache-line to be invalidated in the L1D (if it happens to be
there already).  This patch eliminates a guaranteed L1D cache-miss
and, by itself, is good for a 1-2 cycle improvement for heavy-weight
syscalls.

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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